International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019
p-ISSN: 2395-0072
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Analysis of T-Beam Bridge with Mild Steel Strip in Various Positions
Lekshmi Unnikrishnan1, Abhirami Suresh2
1Mtech
2Assistant
Student, Sree Narayana Institute of Technology, Adoor, Kerala
Professor, Sree Narayana Institute of Technology, Adoor, Kerala
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Here Mild steel strips are used as a composite material to
modify the performance of bridge under service loading.
The composite action of steel and concrete provides
resistance to imposing load and more importantly
improves the stiffness of the member. It has many benefits
over ancient reinforced concrete or steel structures; these
include high strength to weight ratio, structural integrity,
dimensional stability etc.
Abstract - T-beam bridge is one of the principal types of
cast-in place concrete bridge. Under service loading T-beam
bridges show excessive deflection, cracking and inadequate
ultimate strength. For improving the performance of bridge,
mild steel strips are used as a composite material. Mild steel
strips increase the stiffness of the member, reduce deflection
of the structure and act as shear reinforcement. They are
economic, durable and are available in varying thickness.
This research presents the study of feasibility and efficiency
of T- beam bridge with Mild steel strip as a composite
material to control deflection. For analysis mild steel strip
are placed in various position in the web portion of the Tbeam. The modeling and analysis are done using ANSYS
R18.1.
1.1 Objective
1.
2.
3.
4.
Key Words: T-beam, Mild Steel Strip, Deflection, Stiffness,
ANSYS.
To explore the innovative construction technology
where steel strip acts compositely with surrounded
concrete
To analyze the bridge with MS steel strips by
placing in different positions.
Increase the stiffness of member by controlling
deflection
To compare the performance of bridge with and
without MS strips in terms of deflection.
2. SOFTWARE USED
Modeling and analysis were done using ANSYS R18.1.
ANSYS was selected since the software is capable of solving
complex structural engineering problems and make better,
faster design decisions.
1.INTRODUCTION
Bridge is a structure providing passageway over an
obstacle without closing the way beneath. Reinforced
Concrete is usually used for highway bridge construction
because of its durability, rigidity, economy and ease of
construction.
3. MODELLING OF BRIDGE
3.1 Bridge Description
T-beam, used in construction, is a load-bearing structure of
reinforced concrete, wood or metal, with a T-shaped cross
section. The top of the T-shaped cross section serves as a
flange or compression member in resisting compressive
stresses. The web of the beam below the compression
flange serves to resist shear stress and to provide greater
separation for the coupled forces of bending.
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T-beam bridge consists of a concrete slab monolithically
cast over longitudinal girders. The number of longitudinal
girders depends on the width of the road. Three girders are
normally provided for a two-lane road bridge. T- beam
bridges are composed of deck slab 20 to 25cm thick and
longitudinal girders spaced from 1.9 to 2.5m.
Span of bridge
Clear width of roadway
Thickness of slab
Wearing coat thickness
Concrete mix
Steel
Width of longitudinal girder
:16m.
:7.5m
:0.2m
:0.08m
: M25
: Fe415 (HYSD)
: 0.3m.
Three main girders are provided at 2.5m spacing and IRC
Class AA tracked vehicle was considered for live load
calculation.
An important and economic combination of construction
materials is that of steel and concrete. The concept of
composite construction has been adopted in this project to
regulate deflection and to check failure due to serviceability
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International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019
p-ISSN: 2395-0072
www.irjet.net
Fig -1: Dimension of bridge
Fig -5: Cross section of bridge with 3.15mm mild steel
strip (Full depth of web)
The modelling was done using ANSYS R18.1. Three models
of bridge were created.
1. Model of conventional bridge
2. Model of bridge with 3.15mm mild steel strip
a) Full depth of web throughout the length.
b) Top and bottom of the web, throughout the
length.
Fig -6: Position of mild steel strip(3.15mm) (Top and
bottom of web)
Fig -2: Model of conventional bridge
Fig -7: Cross section of bridge with 3.15mm mild steel
strip (Top and bottom of web)
4. LOADS ON BRIDGE
Various types of loads are considered for design of bridge
structures. These loads and their combinations decide the
safety of the bridge construction during its use under all
circumstances. The design loads should be considered
properly for perfect design of bridge. Different design loads
acting on bridges are explained below.
1. Dead load
2. Live load
3. Impact load
4. Wind load
5. Longitudinal forces
6. Centrifugal forces
7. Buoyancy effect
8. Effect of water current
9. Thermal effects
10. Deformation and horizontal effects
11. Erection stresses
Fig -3: Position of mild steel strip (3.15mm) (Full depth of
web)
Fig -4: Layout of bridge with mild steel strip (3.15mm)
(Full depth of web)
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12. Seismic Loads
The analysis of bridge with and without mild steel strip was
done using ANSYS R18.1 to find out the total deformation
IRC recommended some imaginary vehicles as live loads
which will give safe results against the any type of vehicle
moving on the bridge. The vehicle loadings are categorized
in to three types and they are
1. IRC class AA loading
2. IRC class A loading
3. IRC class B loading
Here, IRC Class AA tracked vehicle loading is adopted as live
load
that occurs on the bridge.
Fig -10: Total deformation diagram of conventional bridge
4.1 IRC Class AA Loading
This type of loading is considered for the design of new
bridge especially heavy loading bridges like bridges on
highways, in cities, industrial areas etc. In class AA loading
generally two types of vehicles considered, and they are
tracked type and wheel type.
Fig -11: Total deformation diagram of bridge with
3.15mm mild steel strip (Full depth of web)
Fig -8: IRC Class AA tracked vehicle
Fig -12: Total deformation diagram of bridge with
3.15mm mild steel strip (Top and bottom of web)
6. RESULTS AND DISCUSSIONS
From the analysis done different parameters like deflection
and stiffness were taken into consideration to check the
feasibility of the project.
Fig -9: Loading diagram of conventional bridge
Table -1: Deformation obtained from analysis
SL
NO
1
5. ANALYSIS
5.1 Transient Analysis
Transient dynamic analysis is a technique used to determine
the dynamic response of a structure under the action of any
general time-dependent loads. We can use this analysis to
determine the time varying displacements, strains, stresses
and forces in a structure as it responds to any combination of
static, transient and harmonic loads.
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2
3
Position of Strip
Without the strip
(Conventional)
Full depth of web
Top and bottom of web
Deformation
4.2332
2.0136
2.1191
7. CONCLUSION
Providing mild steel strips has proved to reduce the
deflection in bridges considerably. Also 3.15 mm thick steel
strip is found to be more effective on comparing with other
available thickness of strips. Analysis was done using ANSYS
R18.1 on bridges by varying the position of mild steel strip.
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ISO 9001:2008 Certified Journal
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International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 06 Issue: 04 | Apr 2019
p-ISSN: 2395-0072
www.irjet.net
For the analysis two positions were considered which
include placing the strip in full depth of the web and top and
bottom of the web. The results were comparable. Hence
providing mild steel strips in full depth is advisible
considering economy and ease of installation.
ACKNOWLEDGEMENT
The Author(s) wish to express their special gratitude to Dr.
P. G. Bhaskaran Nair, PG Dean, Sree Narayana Institute of
Technology, Adoor, Above all the author(s) thank GOD
Almighty for His grace throughout the work.
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[5]
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Asif Reyaz, Mohmad Mohsin Thakur, Ali, Ishtiyak
Ahmad“Deflection Control In RCC Beams By Using Mild
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